Question 1046894
I would recommend 
1> putting these columns into an Excel Spreadsheet
x	y
1	3
2	5
3	9
4	17
5	33
2> Do a scatter plot in Excel (HIghlight the two columns, Select Insert/Scatter Plot)
and
3> Let Excel generate the trend line that is the closest approximation.
Select Chart - Select Layout/trend Line Options.  Choose and Opt Formula
Appears
{{{y = 1.5545e^(0.602x)}}} is the closest
  *[illustration s_9_8_2016].